This recipe comes from Georgia, formerly of the Soviet Union. The backbone of the marinated chicken is removed so that it lays flat on the grill (or in this case, in a cast iron skillet) and is cooked quickly to sear and crisp the skin, but ensure the meat is tender and juicy inside. Originally, an outdoor "grill" was set up outside, by laying two lines of bricks. Inside the canal were laid pebbles or stones. Then coals were heated and placed on top of the stones. Kebabs, on skewers…